Help! My yorkie has been pooping in his crate lately! He will poop then hide it under the towel. He will mostly do it when Im out. Ive been trying to make sure he goes before I leave some times it works sometimes it doesnt. He also did it again while I was home. I found it like early in the morning. Usually he will let me know when he needs to get out to go. He's 15 weeks old. Any suggestions on what Im doing wrong?